diff --git a/src/emu/diserial.c b/src/emu/diserial.c
index 92acfda03f3..54e48a5b533 100644
--- a/src/emu/diserial.c
+++ b/src/emu/diserial.c
@@ -45,6 +45,7 @@ device_serial_interface::device_serial_interface(const machine_config &mconfig,
 	m_rcv_register_data = 0x8000;
 	m_rcv_bit_count = 0;
 	m_connection_state = 0;
+	m_rcv_flags = 0;
 }
 
 device_serial_interface::~device_serial_interface()